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Summary of Intangible Assets Acquired (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended 0 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Aug. 01, 2014
Business Acquisition [Line Items]      
Fair Value $ 0us-gaap_FinitelivedIntangibleAssetsAcquired1 $ 8,205us-gaap_FinitelivedIntangibleAssetsAcquired1  
Other intangibles - programming content | Wise Brother Media Inc      
Business Acquisition [Line Items]      
Estimated Useful Life in Years     4 years
Fair Value     $ 5,025us-gaap_FinitelivedIntangibleAssetsAcquired1
/ us-gaap_BusinessAcquisitionAxis
= cmls_WiseBrotherMediaIncMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_MediaContentMember